#define uchar unsigned char 
#define uint unsigned int 
uint Key_1=30;
uint Key_2=31;
uint Key_3=32;
uint Key_4=33;
uint Key_5=34;
uint Key_6=35;
uint Key_7=36;
uint Key_8=37;
uint Code_1=3;
uint Code_2=4;
uint Code_3=5;
uint Code_4=6;
uint Code_5=7;
uint Code_6=8;
uint Code_7=9;
uint Code_8=10;

void setup()
{
  pinMode(Key_1,INPUT);
  pinMode(Key_2,INPUT);
  pinMode(Key_3,INPUT);
  pinMode(Key_4,INPUT);
  pinMode(Key_5,INPUT);
  pinMode(Key_6,INPUT);
  pinMode(Key_7,INPUT);
  pinMode(Key_8,INPUT);
  pinMode(Code_1,OUTPUT);
  pinMode(Code_2,OUTPUT);
  pinMode(Code_3,OUTPUT);
  pinMode(Code_4,OUTPUT);
  pinMode(Code_5,OUTPUT);
  pinMode(Code_6,OUTPUT);
  pinMode(Code_7,OUTPUT);
  pinMode(Code_8,OUTPUT);
  digitalWrite(Code_1,HIGH);
  digitalWrite(Code_2,HIGH);
  digitalWrite(Code_3,HIGH);
  digitalWrite(Code_4,HIGH);
  digitalWrite(Code_5,HIGH);
  digitalWrite(Code_6,HIGH);
  digitalWrite(Code_7,HIGH);
  digitalWrite(Code_8,HIGH);
  digitalWrite(Key_1,HIGH);
  digitalWrite(Key_2,HIGH);
  digitalWrite(Key_3,HIGH);
  digitalWrite(Key_4,HIGH);
  digitalWrite(Key_5,HIGH);
  digitalWrite(Key_6,HIGH);
  digitalWrite(Key_7,HIGH);
  digitalWrite(Key_8,HIGH);
}

void loop()
{
  if(digitalRead(Key_1)==0)
    {
      delay(10);
      if(digitalRead(Key_1)==0)
      {
        digitalWrite(Code_1,LOW);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
      if(digitalRead(Key_1)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
    }
    
   if(digitalRead(Key_2)==0)
    { 
      delay(10);  
      if(digitalRead(Key_2)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,LOW);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }    
      if(digitalRead(Key_2)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
    }
    
   if(digitalRead(Key_3)==0)
    {
       delay(10);
      if(digitalRead(Key_3)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,LOW);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
      if(digitalRead(Key_3)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
    }
    
   if(digitalRead(Key_4)==0)
    {
      delay(10);
      if(digitalRead(Key_4)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,LOW);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
      if(digitalRead(Key_4)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
    }
    
  if(digitalRead(Key_5)==0)
   {
     delay(10);
      if(digitalRead(Key_5)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,LOW);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
      if(digitalRead(Key_5)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
   }
   
  if(digitalRead(Key_6)==0)
    {
      delay(10);
      if(digitalRead(Key_6)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,LOW);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
      if(digitalRead(Key_6)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
    }
    
   if(digitalRead(Key_7)==0)
    {
      delay(10);
      if(digitalRead(Key_7)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,LOW);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
      if(digitalRead(Key_7)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
    }
    
  if(digitalRead(Key_8)==0)
   {
     delay(10);
      if(digitalRead(Key_8)==0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,LOW);
        delay(10);
      }
      if(digitalRead(Key_8)!=0)
      {
        digitalWrite(Code_1,HIGH);
        digitalWrite(Code_2,HIGH);
        digitalWrite(Code_3,HIGH);
        digitalWrite(Code_4,HIGH);
        digitalWrite(Code_5,HIGH);
        digitalWrite(Code_6,HIGH);
        digitalWrite(Code_7,HIGH);
        digitalWrite(Code_8,HIGH);
        delay(10);
      }
   }
}